Pump



Patented Feb. 6, 1934 UNITED STATES PATENT" FFICE 9 Claims.

My invention relates to pumps and has a particular reference to power operated reciprocating air pumps.

The object of my invention is to provide an 6 air pump which can be used as an air compressor, a suction pump, or a low pressure pump for various testing purposes. For this purpose I provide the pump cylinder with outlets at the front and rear ends for compressor valve chambers, and, also, I provide the front cylinder head 40 seat 14.

withadditional intake and exhaust valves for producing alternately compression and suction under predetermined tension of special valves. The outlet for these special valves is especially adapted for testing various devices and, particularly, musical instruments and toys.

My invention is more fully described in the accompanying specification and drawings in which- Fig. 1 is a sectional elevation of my pump, Fig. 2 is an end view of the testing pipe, Fig. 3 is a sectional view taken on the line 3-3 of Fig. 1, Fig. 4 is a sectional view of a modified construction, Fig. 5 is an elevation of my pump, and Fig. 6 is a plan view of same.

My pump consists of a cylinder 1 with a sliding piston 2 on a piston rod 3. A rear head 4 is provided with a packing gland 5 for the rod 3. The front head or cover 6 has a valve hous- 4 forms a valve seat 8 for a suction valve 9. The latter has a tubular stem 10 sliding in a cupshaped guide 11 screwed into a special recess in 5 the cover 6 and provided with air vents 12.

A spring 13 tends to keep the valve closed against the seat. 8. The valve 9 has a hole in the center forming a valve seat 14 for a ball 15. The latter is pressed by a spring 16 to the The other end of the spring rests against a cap 17 screwed on the end of a tubular extension 18 on the valve 9. Air vents 19 are provided in the walls of this extension. This extension has a disc 20 which forms a guide 5 for the valve assembly by sliding inside of a tubular extension or recess 21 in the cover 6.

The disc has slots 22 for the air. The extension 21 has a central hole 23 and is threaded on the outside for a cap 24. A nipple 25 for a rubber hose 26 is fitted with its end against the end of the extension 21 and has an enlargement 2'7 fitting inside of the cap 24 and engaged by the cap for clamping the nipple against the end of the extension 21.

' The cylinder 1 has vents 28 and 29 communiing in the shape of a recess '7 the edge of which 7 This part of the apparatus operates as an air eating with pipe nipples 30 connected with valve housings 31 and 32. These housings are provided with valve seats 33 for air valves 34 pressed against the seats by springs 35 in closing caps 36. Air vents 37 lead to the seats from the out- 9 side. A screw plug 38 is provided for the vent in the housing 32. The housings are also provided with holes 39 with seats for balls 40 pressed against the seats by springs 41. The spring tension can be regulated by screws 42 with lock nuts 43. Exhaust pipes 44 are connected together into a pipe45 provided with a valve 46. The cylinder 1 is fastened with bolts 47 to a bed plate 48 on which a motor 49 and a gear 70 housing 50 are also supported. The motor is connected by a coupling 51 with a flywheel 52 and a worm 53 on a worm shaft 54. The worm is in mesh with a worm gear 55 on a shaft 56 with a'crank 5'7.

The crank 5'7 is pivotally connected with a connecting rod 58 the other end of which is pivotally connected with the upper end of an oscillating lever 59. The latter is mounted on a shaft 60 supported in brackets 61. The lower end of the lever 59 has a fork 62 with slots 63 for sliding blocks 64 rotatively supported on trunnions 65 on a sleeve 66 on the piston rod 3. The extension 67 of the rod is slidably supported in a bearing 68.

The operation of my pump is as follows.

With the plug 38 closing the vent 3'7 the front air valve 341s inoperative, and the air is pumped into the pipe line 45 from the rear end only.

compressor for any practical purpose as may be required. If the pump is installed, for instance, in a toy shop, then the compressor outlet can be used for filling balloons, tires, testing swimming floats etc.

The front end of the pump is especially adapted for testing musical instruments, such as mouth harmonicas, saxophones etc., for which purpose the operating end of the rubber pipe 26 is provided with a terminal 69. This terminal is shown in Fig. 2 in the shape of a fiat nozzle adapted to cover one or two holes in a harmonica.

.For other purposes the terminal may have different shape.

The arrangement of the valves 8 and 15 permits the tests to be made both by blowing and suction. With the receding movement of the piston the air is drawn through the valve 8 creating vacuum or suction in the pipe 26; and with the advancing movement of the piston the valve 8 becomes closed and the ball valve 15 is opened thereby admitting the compressed air into the pipe 26. Tension of the spring 16 can be adjusted by the cap 17 which is screwed on the end of the tubular extension 18.

The plug 38 may be closed if a greater degree of suction is desired through the testing pipe 26. If it is desired to use the outfit as a double acting compressor, then the screw plug 38 must be removed and the flexible pipe 25 closed with an ordinary clamp, or the head 21 closed with a blind cap screwed instead of the sleeve 24.

A modified arrangement is shown in Fig. 4. Here the front cover is has a threaded aperture for a tubular plug '71 with a hole 72 for the nipple 25. The valve 9 slides with its tubular extension 10 in a corresponding opening in a hous ing 73 formed integrally with the cover 70. Tension of the spring 13 is adjusted by spacing washers 74 between the flange on the plug '71 and the front surface of the cover '70. The front end of the valve is formed in the shape of a tube '75 with a guiding ring or disc '76 provided with air vents or slots '17. Tension of the spring 16 is adjusted by a screw plug '78. If it is desired to: use the pump for blowing only through the pipe 26 (without suction), then upon removal 1 of the head '71 the holes may be plugged with screws 79, and the parts again assembled. If, on the other hand, suction only is desired, then the holes 81 may be plugged with screws 82, leaving the holes 80 open. The head '70 must be removed for this purpose.

Instead of a motor drive my pump may be ,made hand operated if it is to be used for testing toys only and for small installations. The method of transmitting power from the motor may be also modified in accordance with standard arrangements for such purpose.

Important advantages of my pump are that it is compact and efficient, can be operated as a double acting compressor or as a testing pump for low pressure and vacuum, also that it can be used as a combined device for obtaining air under high pressure and, at the same time, through a separate outlet, either a low pressure air blast, or alternately suction and blast. My pump provides a very convenient means for testing and demonstrating musical instruments and other devices which must be taken in the users mouth, thereby eliminating the danger of communicating disease when several customers are touching the same device with their lips. All the preliminary tests in the factory and in the show rooms or stores may be made with my pump, and only the final user will be .actually touching the toys or musical instru- .ments with his lips.

I claim as my invention:

1. In a pump, the combination with a cylinder provided with air ducts at its front and rear ends, of a piston slidably supported in said cylinder, covers at the front and rear ends of said cylinder, valve housings connected with said air ducts, intake and exhaust valves in said housings, a common pipe extending from said exhaust valves, a housing in said front cylinder cover, supplementary intake and exhaust valves in said cover housing, and a flexible pipe extending from said cover housing and adapted for testing air operated devices.

2. .In a pump, the combination with a cylinder provided with air ducts at the front and rear ends, of a piston slidably supported in said cylinder, covers for the front and rear ends of said cylinder, valve housings connected with said air ducts, in-

take and exhaust valves in said housings, a common exhaust pipe extending from said exhaust valves, a housing in said front cover, supplementary intake and exhaust valves in said housing, a flexible pipe extending from said cover 80 housing and adapted for testing mouth operated devices, and means to render said front cylinder intake valve inoperative when said supplementary intake valve is in its operative condition.

3. In a pump, the combination with a. cylinder, of covers for the rear and front ends of said cylinder, a piston in said cylinder, a rod connected with said piston and passing through said rear cover, intake and exhaust valves connected with the rear end of said cylinder, intake and exhaust valves connected with the front end of said cylinder, supplementary intake and exhaust valves in said front cover, and means to render said supplementary exhaust valve inoperative.

4. In a pump, the combination with a cylinder, of covers for the rear and front ends of said cylinder, a piston in said cylinder, a rod on said piston slidably fitted in said rear cover, intake and exhaust valves connected with the rear end of said cylinder, intake and exhaust valves connected lOO with the front end of said cylinder, supplementary intake and exhaust valves in said front cover, a flexible pipe extending from said supplementary valves and adapted for testing air operated devices, means, to render said fronti cylinder intake valve inoperative, and means to render said supplementary exhaust valve inoperative.

5. In a pump, the combination with a cylinder, of covers for the rear and front ends of said cylin-' der, 9. piston in said cylinder, a rod extending from said piston and passing through said. rear cover, valve housings connected with the front and rear ends of said cylinder, intake and exhaust valves in said housings, said front cover1l5 being provided with a tubular chamber, a supplementary intake valve in said tubular chamber,

a supplementary exhaust valve in said supplementary intake valve, a pipe extending from said tubular chamber, said tubular chamber being provided with air ducts for said supplementary intake valve, the latter being provided with air ducts for said supplementary exhaust valve, means to close said air ducts in said tubular chamber, thereby rendering said supplementary intake valve inoperative, and means to close said air ducts in said intake valve, thereby rendering said supplementary exhaust valve inoperative.

6. In a pump, the combination with a cylinder, of covers for the rear and front ends of said cylinder, a piston in said cylinder,'a piston rod slidably fitted in said rear cover, intake and exhaust valves connected with the front and rear ends of said cylinder, said front cover being provided with a valve chamber, a supplementary intake 135 valve in said chamber, the walls of said chamber being provided with air ducts connecting said chamber with the front space in said cylinder, said supplementary intake valve being adapted to be rendered in operative by closing said air ducts, an exhaust valve in said chamber, and a pipe extending from said chamber.

7. In a pump, the combination with a cylinder, of a piston in said cylinder air intake valve in said cylinder, a cover at the front end of said cylinder, a tubular housing in said cover extending from the outside to the inside of said cylinder, a supplementary intake valve in the inner portion of said housing, a stem on said supplementary valve slidably fitted in the wall of said 159 housing and extending inside of said cylinder, the walls of said inner housing being provided with air ducts adapted to be closed for rendering said supplementary valve inoperative, an exhaust valve in said intake valve, and a flexible tube adapted to be detachably connected with the outer end of said housing.

8. In a pump, the combination with a cylinder, of a piston in said cylinder an intake valve in said cylindena tubular housing extending from the outside to the inside of said cylinder, a supplementary intake valve in the inner portion of said housing, a stem on said supplementary valve extending through the inner portion of said housing into said cylinder, said supplementary valve being adapted to deliver air into said cylinder through the operative end of said housing, an exhaust valve in said supplementary intake valve adapted to deliver air from said cylinder through said operating end of the housing, means to render said supplementary intake valve inoperative, for delivering only compressed air through said end of the housing.

9. In a pump, the combination with a cylinder, of a piston in said cylinder, intake and exhaust valves in said cylinder, a tubular housing at the end of said cylinder, a supplementary intake valve in the inner portion of said housing, a stem on said supplementary valve extending through the inner portion of said housing into said cylinder, said supplementary valve being adapted to deliver air into said cylinder through the operative end of said housing, the walls of said inner portion of the housing being provided with vent holes, said vent holes being adapted to be closed thereby rendering said supplementary intake valve inoperative, a tubular extension on said valve, and a supplementary exhaust valve in said tubular extension, the walls of said tubular extension being provided with vent holes, said last named vent holes being adapted to be closed thereby rendering said supplementary exhaust valve inoperative.

ANDREW J. KOVACH. 

